<template>
     <div class="todo-header">
        <input type="text" placeholder="请输入你的任务名称，按回车键确认" @keyup.enter="add"/> 
        <!-- event.target.value -->
      </div>
</template>
<script>
import {nanoid} from 'nanoid'
    export default {
        name: 'MyHeader',
        props:['receive'],
        // data(){
        //   event:''
        // },
       methods:{
        add(event){
          //判断输入是否为空
          if(!event.target.value) alert('输入不能为空')
            //将用户输入包装成为todo对象
           else{ const todoObj={
                id:nanoid(),
                title:event.target.value,
                done:false
            }
            console.log(todoObj);
            event.target.value="";
            this.receive(todoObj)}
        }
       
       }
       
    }
</script>
<style scoped>
/*header*/
.todo-header input {
  width: 560px;
  height: 28px;
  font-size: 14px;
  border: 1px solid #ccc;
  border-radius: 4px;
  padding: 4px 7px;
}

.todo-header input:focus {
  outline: none;
  border-color: rgba(82, 168, 236, 0.8);
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
}

</style>